The Change of Flow Pattern from Stratified to Stratified-Wavy for Condensation in Wire on Tube Heat Exchangers

Q3 Chemical Engineering

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Pub Date : 2024-06-01 DOI:10.37934/arfmts.117.2.105115

Louay Abd Al-Azez Mahdi, Hasanain Adnan Abdul Wahhab, Miqdam Tariq Chaichan

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Abstract

Flow patterns inside wire-on-tube condensers with different refrigerant mass flow rates were studied in a theoretical study. In this study, tubes with diameters of 3.25 mm (3/16"), 4.83 mm (1/4") and 6.29 mm (5/16") were used. R-134a and R-600a cooling fluids were used at condensing temperatures of 54.4°C, 45°C, and 35°C. The results of this study were obtained using Equal Equation Solver (EES) software. The proposed model was able to predict the type of refrigerant flow pattern based on the limitations reported in previous studies. It was possible to distinguish four kinds of flow patterns: laminar, wavy laminar, plugged, and spiral. The first variation in flow pattern from laminar to wavy laminar flow found between 0.8 and 0.39, and a second variation in flow pattern found from wavy laminar flow to plug or slug flow between 0.15 and 0.05. For the refrigerant conditions, the condensation temperature did not affect the flow pattern. When using R-134a, the inner tube diameter had no effect on the flow pattern. Change occurs with R-600a as inner diameter was increased.

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管线式热交换器中从分层到分层-波浪式冷凝的流动模式变化

理论研究对不同制冷剂质量流量的线对管冷凝器内部的流动模式进行了研究。研究中使用了直径分别为 3.25 毫米（3/16 英寸）、4.83 毫米（1/4 英寸）和 6.29 毫米（5/16 英寸）的管子。使用 R-134a 和 R-600a 冷却液，冷凝温度分别为 54.4°C、45°C 和 35°C。这项研究的结果是通过等式求解器（EES）软件得出的。根据以往研究中报告的局限性，所提出的模型能够预测制冷剂流动模式的类型。可以区分出四种流动模式：层流、波浪形层流、堵塞和螺旋。从层流到波浪形层流的第一种流动模式变化在 0.8 到 0.39 之间，从波浪形层流到塞流或蛞蝓流的第二种流动模式变化在 0.15 到 0.05 之间。在制冷剂条件下，冷凝温度不会影响流动模式。使用 R-134a 时，内管直径对流动模式没有影响。使用 R-600a 时，随着内径的增加，流动模式会发生变化。

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来源期刊

Journal of Advanced Research in Fluid Mechanics and Thermal Sciences Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

2.40

自引率

0.00%

发文量

176

期刊介绍： This journal welcomes high-quality original contributions on experimental, computational, and physical aspects of fluid mechanics and thermal sciences relevant to engineering or the environment, multiphase and microscale flows, microscale electronic and mechanical systems; medical and biological systems; and thermal and flow control in both the internal and external environment.